[JeffBazell]

How do I know if the air shutters in front are correctly opening or closing? There's no indicator or DIC message.

 

[Robby]

If the shutters aren't operating correctly a check engine light will set.

Rob

 

[obermd]

When its cold they'll stay closed once they close. The car will reopen them only if it needs the additional cooling.

 

[Cruzen Vegas]

At highway speed, set your cruise control, then climb out your window and crawl on your hood and dip your head over the front end and take a gander through the lower grill, it should be closed...

 

[Alex V.]

At highway speed, set your cruise control, then climb out your window and crawl on your hood and dip your head over the front end and take a gander through the lower grill, it should be closed...

This. Selfie or it didn't happen.

 

[obermd]

I'll just leave this here.

 

[CRUISE-CRUZE]

How do I know if the air shutters in front are correctly opening or closing? There's no indicator or DIC message.

Do what I did a while ago:
http://www.cruzetalk.com/forum/9-ge...ero-shutter-function-check-2.html#post1528401

 

[Steelmesh]

If the shutters aren't operating correctly a check engine light will set.

Rob

Looking at a 2018+ OEM wiring diagram, I came across a LIN bus, it was labeled a shutter control. LIN is a two-way 1-wire communication bus, so the shutter should be reporting back it's actual position in this application. GM may also have a feedback-loop.